Vibration arrester for tube frames



Dec. 28, 1937. w. w. ROBERTSON 4 VIBRATION ARRESTER, FOR TUBE FRAMES Filed April 15, 1936 2 Sheets-Shget l vtson Dec. 28, 1937. w. w. ROBERTSON 2,103,324}

VIBRATION ARRESTER FOR TUBE FRAMES Filed April 15, 1936 2 Sheets-Sheet 2 i Attorney k Patented Dec. 28,1937

UNITED STATES:

PATENT OFFICE VIBRATION ARRESTER FOR TUBE FRAMES setts Application April 15, 1936, Serial No. 74,527

9 Claims. (Cl. 139-9) This invention relates to improvements in Axminster looms and it is the general object of the invention to prevent vibration of the tube frames as they are presented to the fabric and during the 5, rolling-in operation which places tuft yarns between the binder warps.

Axminster looms operate with chains carrying a series of tube frames which are moved one at atime to tuft forming position. It is customary to employ a transfer arm at each side of the loom so arranged as to unclutch the tube frames from the chains and move them down toward the cloth. In wide looms the down motion of the tube frame is likely to be accompanied by an objectionable vibration of the tube frame, and this may also occur even whena carrier is provided;

to preventsagging of the tube frame under the action of gravity. During the rolling-in operation the free color tuft yarns extending from the yarn tubes pass under and up behind a shot of filling laid by aweft needle. If the tube frame should vibrate upwardly a sufficient amount the color yarns are drawn under the pick of filling so that the rear part of the tuft is low; It is 25 an important object of my present invention to impose a light restraining force on the tube frame at some point intermediateits ends to arrest the vibration and thereby insure the formation of full height tufts. 30 In my prior Patent No. 1,604,318 I have illus- 1 trated a tube frame carrier extending across the loom and so constructed as to support the tube frame throughout its length. When my present invention is applied to a loom having such a carrier the restraining force is applied preferably to the carrier and through the latter indirectly to the tube frame.

In carrying my invention into effect I find it convenient to employ a thin leaf spring suffi- 40 ciently stiff to arrest vibrations but yielding enough to permit the rolling-in operations of. the tube frame, or the carrier if the loom be provided with the latter. The leaf spring may be mounted on a support located approximately at the center of the loom and adjustable with re spect to the path traversed by the tube frame during tuft forming operations to vary the pres.- sure of the restraining force. 7

With these and other objects in view which 50 will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth.

In the accompanying drawings, wherein I have shown two forms of the invention,

Fig. 1 is a vertical section taken transversely through a loom and having the preferred form of my invention applied thereto, the tube frame about to become active being shown ready to leave the transporting chain,

Fig. 2 is a view similar to Fig. 1 but with the active tube frame inthe process of forming the tuft,

Fig.3 is a front elevation looking in the direction of arrow 3, Fig. 1 andzillustrating the method 10 of supporting the vibration arrester, V

Fig. 4 is a vertical detailed plan takenin the direction of arrow 4, Fig. 1, and

Fig. 5 is a View similar to a portion of Fig. 2 but showing amodified form of my invention-l5 wherein a carrier bar supports the tube frame and is in engagement with the vibration arrester.

Referring to the drawings, I have shown a transporting shaft In with a sprocket H to advance a transporting chain l2 carrying a series of tube frames l3. The shaft l0 may be mounted on the loom frame a portion of which is designated at I4 and may be driven by mechanism not shown but well understood. Each tube frame includes a bar Hi from which project a series of relatively small narrow yarn tubes l6, and each tube frame carries a spool H to provide the tuft yarns 18 which extent'through the tubes I6. A transverse shaft 20 has projecting for wardly therefrom at each end a carrier arm 2| on which is pivoted a clutch lever 22. The forward end of each lever is provided with a clutch 23 movable about a pivot 24 on the arm by forces transmitted through an operating T061 25. V

During loom operation the sprocket H advances the tube frames to transfer position one at a time and the transfer arms 22 act to release the tube frame in lowest position from the chain. Thereafter the transfer shaft 20 rocks in a left 40 hand direction viewed in Fig. 1 to lower the tube frame, causing the tuft tubes It to enter between the warp bindersW which extend from the rear of the loom forwardly to define a shed; When the tube frame is in low position it rolls from the dotted to the full line position shown in Fig. 2, after which the tube frame is caused to straighten to a'substantially vertical position to .be raised for the purpose of drawing the tuft yarn properly into position between the binders W. V

The matter thus far described operates in the usual manner and of itself forms no part of my present invention. It'is a matter of observation, however, that on wide looms during the descent .55

of the tube frame from the position of Fig. 1 to the positions indicated in Fig. 2 there may arise undesirable Vibrations of the tube frame which as already stated interfere with the correct placing of the tuft yarns l8.

In carrying the preferred form of my present invention into effect I provide a support bracket 30 having a hub 3! which surrounds but is loose with respect to the transfer shaft 20. The support extends forwardly and is positioned vertically by a link 32 pivoted thereto and projecting upwardly through an angle brace 33 secured to the loom arch 34. Nuts 35 afford a vertical adjustment of the support 39 with respect to the arch so that the support may assume several vertical positions.

As set forth herein the support may have an upturned end 40 to the forward face of which is secured a strap 4| by means of bolt 42 and this strap extends downwardly and forwardly, terminating somewhat behind the path traversed by the tube frame as the later moves from the trans porting chain toward cloth forming position. A relatively light leaf spring 45, shaped and positioned as indicated in Fig. 1, is secured to the strap as at 46. The spring 45 projects into the path of the descending tube frame but does not engage the latter until it is near the cloth being woven. When the tube frame is low the leaf spring will exert a light force thereon tending to arrest vibration, with the result that the tubes l6 and tuft yarns l8 projecting therefrom are presented correctly between the warp binders W and the resultant tufts are of the proper height.

The modified form of my invention may be applied to looms of extra width wherein the tube frame may be carried from the chain to cloth forming position by means of a carrier bar 59 formed preferably of two sheet metal bent sections 5i and 52 extending across the width of the loom and supporting a tube frame throughout its length. When such a carrier is employed it will be engaged by the spring 45 to have its vibration arrested. The carrier and its relation to the tube frame may be the same as that set forth in my prior Patent No. 1,604,318 and the spring 45 will be so located as to project into the path of the carrier when the latter approaches the cloth. In either form of the invention the spring 45 is effective to prevent vibration of the tube frame by exerting a light yielding force either on the tube frame directly or on the carrier therefor at a point intermediate the ends of the tube frame.

In order that my invention may be used conveniently either with or Without the carrier I provide the upper end of the spring with a slot 47 through which a bolt 46 passes. I loosen the latter and slide the spring back and forth on the strap 4| and correctly locate the spring with respect to the paths of either the tube frame or the carrier.

From the foregoing it will be seen that I have provided simple means for imposing a yielding resisting force to a tube frame moving toward cloth forming position for the purpose of arresting vibration thereof to the end that the tufts may be of the proper height and the yarn tubes register with the binders. It will also be seen that manipulation of the link 32 affords means for adjusting the position of the spring 45 vertically, while Variation in the setting of said spring longitudinally of the strap 4! through adjustment of the bolt 46 permits the device to be used either for direct engagement with the tube frame, or with the carrier.

Having thus described my invention it will be seen that changes and modifications maybe made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, but what I claim is:

1. In an Axminster loom, a transporting chain, a series of yarn tubes carried by the chain and from which project tuft yarns, carrier means to convey the yarn tubes and yarns from the transporting chain to cloth forming position along a given path, and yielding stationary means located intermediate the ends of the tube frame and projecting into the path of the carrier means to engage the latter and exert a yielding pressure thereon to arrest vibration of said carrier means.

2. In an Axminster loom, a series of yarn tubes from which project tuft yarns, carrier means to convey the yarn tubes and yarns to cloth forming position, a fixed support located intermediate the ends of the loom, and a stationary yielding element mounted on the support and projecting into the path of movement of the carrier means as the latter moves toward cloth forming position to en-' gage said carrier means and arrest vibration thereof.

3. In an Axminster loom, a set of yarn tubes, a carrier therefor having rolling-in movements during tuft forming operations of the loom, and stationary yielding means normally projecting into the path of movements of the carrier and having friction and sliding engagement with the carrier during its rolling-in movements to arrest vibration thereof.

4. In an Axminster loom, a set of yarn tubes; a carrier therefor having rolling-in movements during the tuft forming operation of the loom, and stationary yielding means along which the carrier slides during the rolling-in movements to exert a vibration arresting force on said carrier.

5. In an Axminster loom, a set .of yarn tubes, a carrier to support and convey the yarn tubes toward the cloth being woven, and normally stationary yielding means extending into and along the path of the carrier to engage and impose a vibration arresting force on said carrier as the same moves.

6. In an Axminster loom having a transporting chain, a tube frame, transfer means to convey the tube frame from the chain to cloth forming position, and normally fixed means to impose-a, yielding force on the tube frame at a point intermediate the ends thereof to arrest vibration of said tube frame.

7. In an Axminster loom having a transporting chain, a tube frame, transfer means to convey the tube frame from the chain to cloth forming position, and a fixed spring element extending along and into the path of travel of the tube frame to impose a yielding force on the tube frame to arrest vibration thereof.

8. In an Axminster loom having a transporting chain, a tube frame, a shaft, transfer means movable about the shaft to convey the tube frame from the chain to cloth forming position, a supportmounted on the shaft and located intermediate the ends of the tube frame means to give the support a plurality of different fixed positions about the shaft, and a yielding element carried by the support and projecting into and along the path of movement of the tube frame as the latter moves from the transporting chain to cloth forming position to exert aforce on the tube frame tending to arrest vibration thereof.

9. In an Axminster loom having a'transporting chain, a tube frame, ashai t, transfer means movable about the shaft to convey the tube frame from the chain/to" cloth forming position, a support mountedbn the shaft and. located at a point intermegiiate the ends of the loom, a spring carriedgy'the support and projecting into the path e tube frame as the'latter moves from the transporting chain to cloth forming position to arrest vibration of the tube frame, and means to hold the support and spring in any one of a plurality of fixed; positions about the shaft to vary the position of said spring along the path of the 5 tube frame.

WILLIAM W. ROBERTSON. 

